Question

9. if u = y/x ,then the value of d^2 u / dx^2 + d^2 u/ dy^2 = ?​

Answer 1

Answer:

Step-by-step explanation:

u = y/x

du/dx =  - y/x²                           du/dy  = 1/x

d²u / dx² = 2y/ x³                     d²u / dy² =  0

d²u /dx²  + d²u /dy²  =  2y /x³  + 0

                                 = 2y / x³